\newproblem{lay:1_3_7}{
   % Problem identification
	 \begin{large}
 	   \hspace{\fill}\newline
     \textbf{Lay, 1.3.7}
	 \end{large}
	 \\
   \ifthenelse{\boolean{identifyAuthor}}{\textit{Carlos Oscar Sorzano, Aug. 31st, 2013} \\}{}

   % Problem statement
   In the following figure
	 \begin{center}
		  \includegraphics[width=8cm]{Tema1/lay_1_3_7.eps}
	 \end{center}
	 write $\mathbf{a}$, $\mathbf{b}$, $\mathbf{c}$ and $\mathbf{d}$ as a function of $\mathbf{u}$ and $\mathbf{v}$.
}{
   % Solution
	\begin{center}
		$\mathbf{a}=\mathbf{u}-2\mathbf{v}$\\
		$\mathbf{b}=2\mathbf{u}-2\mathbf{v}$\\
		$\mathbf{c}=2\mathbf{u}-3.5\mathbf{v}$\\
		$\mathbf{c}=3\mathbf{u}-4\mathbf{v}$\\
	\end{center}
}

\useproblem{lay:1_3_7}
\ifthenelse{\boolean{eachProblemInOnePage}}{\newpage}{}
